RequiredValidator class

A validator that ensures the value is non-null and non-empty.

Implemented types

• ValueValidator

Annotations

• @immutable

Constructors

RequiredValidator()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

type → String

no setter, override

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, dynamic>

Returns the JSON-compatible representation of this validator.

toString() → String

Returns the string encoded JSON representation for this class. This will remove all null values and empty collections from the returned string.

inherited

validate({required String label, required String? value}) → String?

Passes non-empty values and fails on null, empty, or whitespace-only values.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

fromDynamic(dynamic map) → RequiredValidator

Processes the validator object from the given map which must be an actual Map or a Map-like object that supports the [] operator. Any non-null object that is not Map-like will result in an error. A null value will result in a return value of null.

Constants

kType → const String